ARM: rmobile: Enable SCIFA0 early on H2 Stout

The H2 Stout uses SCIFA0 for serial console, make sure it is
available very early on when probing from DT.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/arm/dts/r8a7790-stout-u-boot.dts

@@ -8,3 +8,7 @@
 
 #include "r8a7790-stout.dts"
 #include "r8a7790-u-boot.dtsi"
+
+&scifa0 {
+	u-boot,dm-pre-reloc;
+};